@misc{indiciaeb0de4d28d2da,
  title = {Mineral resources of Alaska, report on progress of investigations in 1911--Geologic investigations along the Canada-Alaska boundary},
  author = {A.G. Maddren},
  year = {1912},
  doi = {10.3133/b520k},
  url = {https://pubs.usgs.gov/publication/b520K},
  note = {Source identifier: b520K}
}